LOCATION ANACOCO LAEstablished Series
TAXONOMIC CLASS: Fine, smectitic, thermic Vertic Albaqualfs
TYPICAL PEDON: Anacoco silt loam - wooded.
(Colors are for moist soil unless otherwise stated.)
A--0 to 4 inches; grayish brown (10YR 5/2) silt loam; weak fine granular structure; friable; many fine roots; medium acid; clear smooth boundary. (3 to 5 inches thick)
E--4 to 11 inches; light gray (10YR 6/1) silt loam; few fine distinct dark yellowish brown (10YR 4/4) mottles; weak coarse subangular blocky structure; friable; few fine roots; very strongly acid; abrupt wavy boundary. (3 to 7 inches thick)
Bt1--11 to 17 inches; grayish brown (2.5Y 5/2) silty clay; common medium prominent yellowish red (5YR 4/6) and strong brown (7.5YR 5/6) mottles; moderate medium subangular blocky structure; firm; few distinct clay films on faces of peds; very strongly acid; gradual smooth boundary. (4 to 10 inches thick)
Bt2--17 to 23 inches; grayish brown (2.5Y 5/2) clay; common medium distinct olive brown (2.5Y 4/4) mottles; weak very coarse subangular blocky structure; few distinct clay films on faces of ped; very strongly acid; gradual smooth boundary. (4 to 18 inches thick)
Bt3--23 to 46 inches; grayish brown (2.5Y 5/2) clay; weak very coarse subangular blocky structure; very firm; few slickensides; few faint clay films on faces of peds; very strongly acid, clear smooth boundary. (14 to 30 inches thick)
C--46 to 80 inches; pale olive (5Y 6/3) silty clay loam; massive; common strata of very fine sandy loam and clay in the lower part; 10 percent fragments of sandstone .2 to .4 inches thick and .8 to 1.2 inches long, oriented horizontally; very strongly acid.
TYPE LOCATION: Rapides Parish, Louisiana; 5 miles northwest of Boyce, Louisiana; 2 miles northeast of Rock Quarry; SE1/4NE/1/4, sec. 1, T. 6 N., R. 4 W.
RANGE IN CHARACTERISTICS: Solum ranges from 40 to 60 inches thick. Base saturation at 50 inches below the top of the argillic horizon ranges from 45 to 85 percent. COLE ranges from .09 to .13 in the top 20 inches of the B horizon.
The A horizon has hue of 10YR, value of 4 or 5, and chroma of 1 or 2. It is silt loam or very fine sandy loam. Reaction ranges from very strongly acid to medium acid.
The E horizon has hue of 10YR, value of 5 or 6, and chroma of 1 or 2. Texture is silt loam, loam, very fine sandy loam, or fine sandy loam. Reaction ranges from very strongly acid to medium acid.
The Bt horizon has hue of 5Y, 2.5Y, or 10YR, value of 5 or 6, and chroma of 2. Mottles in shades of brown, yellow, or red are few or common. Texture is silty clay or clay. Clay content ranges from 40 to 60 percent. Reaction is very strongly acid or strongly acid.
The C horizon has hue of 5Y, value of 4 to 6, and chroma of 2 to 4 or hue of 2.5Y, value of 5, and chroma of 4. Texture is silty clay loam or silty clay, or their channery or very channery counterparts with thin strata of very fine sandy loam and clay. Reaction is very strongly acid or strongly acid. Fragments of siltstone or sandstone are 4 to 35 percent by volume.
COMPETING SERIES: These are the Edna, Herty, Lufkin, Mabank, Oakhurst, and Overcup (T), series in the same family and the Cadeville and Mayhew series. Cadeville soils have a udic moisture regime and chroma of 3 or more in the upper part of the subsoil. Edna, Lufkin, Oakhurst, and Overcup soils have medium acid or more alkaline Bt horizons. Herty soils contain more soluble salt and gypsum. Mayhew soils have neither fragments of sandstone in the substrata nor an abrupt textural change from the albic to the argillic horizon.
GEOGRAPHIC SETTING: These soils are on gently sloping Coastal Plains. Slopes range from 1 to 5 percent. The regolith is marine deposits of acid clay to silty clay loam of the Catahoula Formation that contain fragments of siltstone or sandstone. The climate is warm and humid. Mean annual temperature near the type location ranges from 60 to 70 degrees Fahrenheit. Average annual precipitation ranges from 45 to 60 inches.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the competing Cadeville soils and the Hollywood, Kisatchie, Oula, and Vaiden soils. None of the associated soils have albic horizons with an abrupt textural change to the argillic horizon nor are they saturated in some season within the capillary fringe of the surface. Also, the Hollywood and Vaiden soils have intersecting slickensides.
DRAINAGE AND PERMEABILITY: Somewhat poorly drained; very slow permeability; medium runoff. After periods of heavy rain, a water table is perched above the Bt horizon.
USE AND VEGETATION: Use is mostly as woodland and grazing of livestock. Vegetation is southern pine and mixed hardwoods.
DISTRIBUTION AND EXTENT: Southern Coastal Plains of west-central Louisiana, east-central Mississippi, and eastern Texas. The series is moderately extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Temple, Texas
SERIES ESTABLISHED: Rapides Parish, Louisiana; 1972.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon........0 to 11 inches (A and E horizons).
Albic horizon..........4 to 11 inches (E horizon).
Argillic horizon.......11 to 46 inches (Bt horizon).